WebRTC-UDP video traffic Publication issues

Hello,

When we published video WebRTC by udp to external servers like OVH, Amazon Ec2, Heztner who have Ddos protection in their networks, the video publication fails after to start and to stop manually some times, we have done the same test in some servers in our own public network (we do not have Ddos implementation) the publication is perfect all times. Finally we publish video WebRTC by TCP to external servers (OVH, Amazon Ec2) and the publication is perfect all time too. It is clear that the WebRTC by UDP was blocked by Ddos implementations in servers provider networks, please your help and/or sugerencies; we need to publish WebRtc by UDP in OVH, amazon ec2 and azure servers.